Pulverizing-machine



0. A. KREUTZBERG. PULVERIZING MACHINE. APPLICATION FILED NOV. 8,191 94 RENEWED JULY 9, 1920.

1,368,636. Patented Feb. 15, 1921.

5-- JL QC UNITED STA TEs PATENT OFFICE...

IEULVERIZING-MACHINE.

Specification of LettersPatent.

PatentedFeb. 15, 1921.

Application filedNovember 8, 1919, Serial No. 336,581. Renewed July 8, 1920. Serial No. 394,803.

To all whom it may concern:

Be it known that I, Or'ro A. KnnU'rznnne, a citizen ofthe United States, residing at Lake Bluff, in the county of Lake and State of Illinois, have invented certain new and useful Improvements in Pulverizing-Machines, of which the following is a specifics tion, reference being had to the accompanying drawings, forming a. part thereof.

The purpose of this invention is to provide an improved machine for pulverizing hard materials. It consists in the elements andfeatures of construction shown and described, as indicated in theclaims.

In the drawings:

Figure 1 is a plan view of a machine em; bodying this invention.

Figs. 2 and 3 are sections transaxial with respect to the two cooperating rotary members of the machine, at two different relative positions of said two members.

Fig. 4 is a rear side elevation of one of said rotary members.-

Fig. 5 is a section at the line, 5-5, on Fig. i.

Fig. G is an edge View of one of the rotary members having the parts of'which it consists ad' sted in a special way. 1 V

Fig. is a face view of one of the rotary members showing a slightly modified con struction.

The drawings show a pulverizing machine of a type which'in certain rcspects is familiar, comprising two frusto-conical disks orpulverizing wheels, A. and B, mounted upon parallel axes for rotation of their 'frust'o-conical surfaces in contact or close proximity, and provided with means (not shown) for rotating them toward each other at their proximate sides-that is, in opposite directions about their axes,.for engaging and crushing and grinding between them the materialwhich is introduced between their said proximate revolving surfaces. In machines of this character the crushing and grinding of material submittedto the machine is effectedby drawing, the fragments which are to be crushed between the rolls, down between them at their proximate sides revolving towardeach other and this is elfected partly by. gravity causing the fragments to descend in the narrowing gap between'the two revolving bodies, and partly, and more especially, by the frictionalengagement of the revolving bodies with the fragments as pedient they are lodged upon their revolving surfaces. Particles which are small enough to descend between the two revolving and approaching surfaces very near to their line of tangency are engaged by these surfaces at a very favorable angle for holding them, be-

cause the surfaces approach parallelismas they approach the line of tangency and thereby engage the interposed particles by almost direct pressure toward each other against said interposed particles; but larger particles which become lodged upon both the two revolving bodies at a distance back from their line of contact are much less favorably situated for being engaged, because at such distance back from their tangential contact line or line of greatest, proximity, the two revolving surfaces are at a considerably wide angle to each other and tend to wedge the interposed body back away from their tangential line. lt thus happens that a comparatively large fragment contained in a stream of smaller fragments which is dehvered tothe revolving'bodies for being crushed and ground, will become thus engaged against the bOCllBSSO that they do not grip it and draw it in between them, but so that it com said bodies at a distance away from thetangent line so as to make the angle of engagement very wide. This result is effected by making one of saidrevolving bodies with a portion of its conoidal face projected ofl' abruptly from the remainder, so as to form a shoulder or stepfrom the offset portion to 100 the remainder, which will permit particles at least of as great a diameter as the depth of such shoulder to fall between the two revolving surfaces substantially to the tangential line, so as tobe there gripped by the 105 direct pressure between them, as will be understood from Fig. 2; and also to cause larger particles which cannot by this exfall so deeply between the two revolving bodies, but which may be lodged ders, :20 and 3 1'. tions. And it will be understood that as the two disks, one of which does not have and the forward in the direction'of rotation of the disk having this shoulder, 2', 6., toward the line of meeting; so that particles lodged be tween the two bodies at a considerable dis tance back from their tangent line and not gripped frictionally by them because of the bad angle at which they are lodged thereon will nevertheless be engaged positively by the advancing shoulder, and positively forced through between the two disks, with the effect of crushing them if the pressure is adequate to do so. This may be understood from Fig. 2 in which the offset to form the shoulder faces toward the tangent line of the two disks.

A preferred construction of disk for the purpose of producing the offset and shoulders described is that shown in the drawings, in which the disks, both of which are shown with the frusto conical facing composed of two parts, one of which may be offset from the other, comprise a fiat-faced member, 1, on which there are mounted two halves of a frusto-conical member, one of said halves, a, being permanently secured to the base member, while the other half, 6, is attached thereto by means of headed screws, 0, set loosely through the base member and screwed into the said segment, 6, so that the screws serve to draw the segment back to ward the base; and another set of screws, d, is provided screwed through the base and impinging upon the back of the segment, so that they serve to force the segment away from the base. By the adjustment of these two sets of screws, the segment may be rigidly set at any distance within the range of operation of the screws off from the base. and thereby caused to present its conoidal grinding surface projected beyond and olfset from the conoidal surface of the other half, a, of the-disk. This forms two shoulat diametrically opposite posiother which does have the offset portions described, are revolved for engaging material between them and are pressed toward each other by the springs, C, one of the shoulders willrevolve facing away fromthe line of tangency or line of contact'of the two rolls,

as seen in Fig. 3, while the other will revolve facing toward said line of contact as seen in Fig. 2. One of the shoulders will therefore operate upon and engage the fragments as first above described,cthat is, by permitting the fragment to drop between the two disks nearer to the line of tangency and onto or nearly to the shoulder, so that it will be engaged between the two disks with pressure almost directly toward each other, preventing any possibility of the fragment from escaping or being wedged back from between the rows, and insuring its being crushed when the pressure is adequate to crush it. The other shoulder will; engage fragments as secondly above de scribed and as seen in Fig,- 2; thatis, to

say, fragments of any size becoming lodged, between the two disks will be encountered by the advancing shoulder and positively engaged thereby and forced out between the two disks with the desired crushing effect if the pressure is adequate, In

the first instance, when the shoulder has re volved past the line of tangency, the two disks will approach eachother abruptly and thereby tend to engage between them fragments which might otherwise not be engaged, or will crush, as by a hammer blow, fragments which are lying between them but are not being frictionally engaged .ade-.

quately to draw them in for crushing atthe tangent line. 5

For certain materials and under certain I same direction, and for that purpose one half of the diskentire cone frustum which is to be provided? with such shoulders is made adjustable along the diametric plane of severance between the two halves as seen in Fig. 6. For-this purpose the construction may be to form the base. member with slots; 1*, located parallel totheline of severance betweenthe two halves of the disk,the movable half being secured to the base by headed bolts taking through said slots and enga ing said movable half, the bolts being set tighttohold the movablehalf'atits position of adjustment for producing the shoulder.

In practice for operatingon hard material, a shoulder f th of an inch in height is adequate to give the desired result. l/Vhen the half, I), of the frusto-conical facing which is advanced becomes worn by reason of its taking the greater part of the work, it will be set back to the base, and the other half will then be found to be protruding and forming the desired shoulders.

I claim 2- 1. In a pulverizing machine in combination two rotary bodies and means for revolving them with their surfaces of revolution proximate and revolving toward each other at their proximate sides one of said bodies having it said surface of revolution at a segment thereof offset from the path of revolution of the remainder in a direction for closer proximity of at least a portion of said offset segment to the other of said revolving bodies.

2. In the construction defined in claim 1, the revolving bodies being each frusto-conical and their conoidal faces being those revolving in proximity, and the offsetting of the offset segment of one of them being effected by advancing said offset segment axially toward the other body.

3. 1n the structure defined in claim 1, the offsetting of the offset segment being effected by advancing said ofiset segment toward the other body at one end only of said segment.

4. In the structure defined in claim 1, the revolving bodies being frusto-conical the one having the offset segment comprising a fiat-faced portion upon which said offset segment portion is mounted, the means for so mounting being a set of set screws set through said base portion and screwed into the 1 segment, having heads which are stopped outside said base portion, whereby they are adapted to draw the segment back toward the base, and another set of screws screwed through the base member and impinging upon the back of the segment,

whereby they are adapted to force the seg ment away from the base.

In testimon whereof, I have hereunto set my hand at lhicago, this 31 day of Octo ber, 1919.

OTTO A. KREUTZBERG. 

